Over the winter my project is to install my BOSS NOSS system but talking to a few people it's been said I can make a big power change on head work. I already have Screamin Eagle II cams installed SO does anyone know what the heads flow with the cams & how much more can I flow? From what I read the factory heads are already C & C ported?

Easy answer is YES, you can make them flow much better. How much more power you can get varries from bike to bike, supporting mods, tune, ect. The heads are definatly not CNC from factory. (Only the SE heads were CNC) The 08 and later 1250cc heads are all sand cast.

I think Fitzgerald still offers CNC headwork, you will have to contact them to inquire about potential gains. You will probably also a require larger throttle body. With shipping, throttle body, tune and everything, you are probably looking in the $3k range for maybe 10-20 hp gain.

I agree with RSC on this one, even though with my big bore I port polished and had over sized valves put in, but if your just putting in NOS no sense it stripping the motor to just have head work done.

64mm Throttle body?!? What the head would he need that for?? Most that big bore them only go up to 58mm.

I agree with RSC on this one, even though with my big bore I port polished and had over sized valves put in, but if your just putting in NOS no sense it stripping the motor to just have head work done.

64mm Throttle body?!? What the head would he need that for?? Most that big bore them only go up to 58mm.

Go big or go home right? The 58mm destroyer tb would probably be fine, but 64mm just sounds fun

What size BB did you do? Any chance you did a before and after dyno on your P&P ? I still have the stock 53mm on my 1350.

Few people I talked to the 53mm TB's at full sing don't max out on flow. with nitrous you don't need a bigger TB (Or carbs for some) because N2O is it's own source of oxygen. If your primarly racing were your wide open more then part throttle I can see bigger TB's being a advantage. As for head work I would of hoped the heads would be C & C ported then casted. Maybe just removing them and polishing the ports might give good results?

Ever notice how those 1000-1400 cc carbs on small blocks idle like crap too. you have to "burp" the throttle to keep it running. I think even Big Bore kits you can get away with the 53mm . For the cost of heads a Big Bore might give better results for the cost

It is so easy to overcarbuerate. When I built the 355 for my truck, I originally had a Holley 780 carb... ran strong, but was sort of flat in the mid-range. I downsized it to a 670 Street Avenger, and the motor came alive.

If I was building a motor for my V, since I have an 1130, I'd go with my original plan to use a Destroyer crank, CP pistons at a 1250 bore, and have a 1302. I sold all the parts when I went turbo, but that's what I'd do.

It is so easy to overcarbuerate. When I built the 355 for my truck, I originally had a Holley 780 carb... ran strong, but was sort of flat in the mid-range. I downsized it to a 670 Street Avenger, and the motor came alive.

If I was building a motor for my V, since I have an 1130, I'd go with my original plan to use a Destroyer crank, CP pistons at a 1250 bore, and have a 1302. I sold all the parts when I went turbo, but that's what I'd do.